The invention relates to a protective pipe for underground laying of communication cables. The protective pipe is prepared from hexamethyl phosphoric triamide, triethanolamine borate, zirconium oxide powder, polycarbonate, vinyl acetate, lead sulfate tribasic, ketoconazole, sodium dichloroisocyanurate, isothiazolinone, tea polyphenol, sodium laurylsulfate, butyl carbitol, sodium molybdate, didecyl dimethyl ammonium chloride, polyhexamethylene guanidine, sorbic acid, sodium diacetate, phenolic resin, ester gum varnish, kaolin, talcum powder, aluminum hydroxide powder, montmorillonite, vinyl acetate, nano-zinc oxide, aniline, fluorescent powder, polydimethylsiloxane and tricresyl phosphate. The multiple ingredients are mixed to form the novel composite toughened and strengthened system, toughness, rigidity and elasticity modulus performance indexes are good, the ageing resistance and use performance of the product are greatly improved, and the protective pipe has a good anti-corrosion effect. The protective pipe is high in comprehensive performance and good in use effect.